High Temps in Aero cloner! What will happen?

If the temps in the aero cloner tub (not the surrounding air) get higher than optimal, what will happen to the cuttings, what will the symptoms be? Further more, what is an optimal temp for the Rooting area?

growth slows down ........ 68 66........soil 70 72

i have some yellowing. Do you think it is because of the temp getting warm?
maybe PH, my Ph was around 6.3-6.8

Ph is to high for hydro

u need something around 5.8 (55.58 i think is the range u want)...i am a soil grower that has done alot of resreach for the next step into this game

i looked it up here

5.8 to 6.0 is the best range for hydro.
6.5 to 7.0 is for soil.
You will be fine in hydro from 5.5 to 6.5.